a nucleic acid was analyzed and found to contain 37% a, 16 % g, 22% c, and 25 % t. the nucleic acid must be: single-stranded rna double-stranded rna single-stranded dnadouble-stranded dna

Peritubular capillaries are tiny blood vessels that surround the renal tubules in the kidneys. These capillaries are responsible for the reabsorption of fluids and solutes that have been filtered out of the blood by the glomerulus. The mechanisms of peritubular capillary absorption include:

Osmosis: Water moves from areas of high concentration to areas of low concentration, allowing water to be reabsorbed into the peritubular capillaries.

Active transport: Certain substances, such as glucose, amino acids, and ions, are actively transported across the epithelial cells of the renal tubules and into the peritubular capillaries.

Passive diffusion: Some substances, such as urea and lipid-soluble molecules, diffuse passively across the epithelial cells and into the peritubular capillaries.

Overall, these mechanisms work together to ensure that essential nutrients and fluids are reabsorbed from the renal tubules and returned to the bloodstream, while waste products are excreted from the body.

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There would need to be a removal of the phosphate groups. 17. Enzymes that remove phosphate groups from proteins are protein phosphatases.

Kinase can be activated or deactivated in a variety of ways: through a cis- or autophosphorylation of the kinase itself, binding to activator or inhibitor proteins, or examining their cell location in relation to their substrate.

The phosphate group from the protein kinase is removed by protein phosphatases in the absence of a receptor-binding signal molecule, transforming the active protein into an inactive one. As a result, protein phosphatase deactivates protein kinase, turning off the cells' response.

Proteins undergo phosphorylation and dephosphorylation to transition between two states of activity. Likewise, numerous protein kinases are turned on or off by phosphorylation; Consequently, the cell's network of on-off switches is represented by protein kinases.

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Q- According to Model 2, What would need to occur in the cell to deactivate the protein kinase enzymes?

The transmission of a disease-causing microbe from one person to another (other than mother to the child immediately before or after birth) is the horizontal transmission.

Horizontal transmission is the transfer of an infection or pathogen from one infected person to a noninfected individual. The majority of infections spread horizontally.

An infected person sheds pathogenic germs, which may then contaminate a susceptible host through contact, ingestion, or inhalation.

When an infection is transmitted directly from one person to another, it is known as the person-to-person spread, which is a type of horizontal transmission.

The sharing of personal things, contact with open wounds or sores, sexual contact, and kissing are all examples of person-to-person transmission.

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True. Like blood, lymph flows through vessels to and from the heart.

The lymphatic vessels carry lymph from the tissues and organs to the lymph nodes, where it is filtered and cleansed of foreign substances such as bacteria, viruses, and cancer cells. The cleaned lymph is then returned to the bloodstream via lymphatic vessels that merge into larger vessels, eventually emptying into the veins near the heart.

Lymph flow is propelled by the contraction of smooth muscle in the walls of the lymphatic vessels and by the movements of nearby skeletal muscles.

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The claim that parasitic flatworms evolved from earlier free-living forms after their vertebrate hosts would be devolution and not evolution. This is because, according to evolution, organisms evolve to become more complex and better adapted to their environment, not less complex or less adapted to their environment.

Thus, if a free-living flatworm were to evolve into a parasitic flatworm, it would be losing its ability to live freely and independently, which would be considered a loss of complexity and adaptation. Therefore, the process of evolving into a parasite would be considered devolution rather than evolution.

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Proto-oncogenes encourage the cell to develop, split, and progress through each cell cycle checkpoint. When a proto-oncocogene mutates, it transforms into an oncogene and no longer pauses at cell checkpoints to ensure its regular function. Tumor-suppressor genes inhibit cell development. DNA repair enzymes correct mistakes.

Genes that inhibit tumour growth. These genes instruct your cells on when to halt replication (copy themselves), fix DNA, or eliminate themselves. If these genes are switched off when they should be turned on, cancer can form. Oncogenes. When it's time for your cells to develop, these genes inform them.

Cancers can be caused by a mutation in one of the pair's proto-oncogene alleles. As a result, oncogenes show hostile behaviour. Tumor suppressor genes and proto-oncogenes are two types of genes that can cause cancer.upon transformation. The word oncogenes essentially means "cancer genes," and these genes cause uncontrolled cell development. Normal genes that aid in cell growth are proto-oncogenes. An oncogene is a cancer-causing gene. Uncontrolled cell proliferation is one of the hallmarks of malignancy. As a result of proto-oncogenes...

Biotechnology refers to the use of living organisms or their products to develop or improve products and processes.

Genetic engineering: the alteration of an organism's DNA to alter or produce new traits.

Tissue culture is the process of growing cells or tissues in a lab environment for the manufacturing of drugs, medical research, or scientific study.

Recombinant DNA technology: the process of mixing DNA from several sources to create novel DNA sequences.

Fermentation is the process of using bacteria, yeast, or other microbes to create a desired product, such as beer or bread.

DNA sequences are amplified and copied using the Polymerase Chain Reaction (PCR) method in preparation for further examination or usage in biotechnology applications.

Using microorganisms to remove environmental toxins is known as bioremediation.

Cloning is the process of developing organisms that are genetically identical from a single cell or tissue.

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During rolling circle replication cellular enzymes will repeatedly sit down on the newly synthesized strand of DNA to make the second strand of the dsDNA genome. This process is termed synthesis.

Rolling-circle replication is a process used to replicate circular DNA strands. It was first discovered in virus genomes, but it has since been discovered in other types of DNA as well. Rolling-circle replication is a mechanism for replicating DNA that is frequently used by many viruses and some bacteria. Rolling circle replication entails a strand of DNA acting as a template for a complementary strand to be produced. In rolling circle replication, a circular DNA strand is nicked by an enzyme, which forms a single-strand break in the DNA's backbone.

The circular DNA then unwinds and a single strand is released. A primer is then bound to the nicked region of the circular DNA strand. A polymerase enzyme is used to extend the primer, resulting in the synthesis of a new DNA strand. The original circular DNA strand is re-formed by a DNA ligase enzyme that binds the ends of the newly synthesized DNA strand together.

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The superior colliculus and the pretectum are the two midbrain structures that mediate visual reflexes.

The midbrain, also known as the mesencephalon, is a part of the brainstem located between the hindbrain and the forebrain. It's a tiny portion of the brain that performs a variety of functions, including vision, hearing, eye motion, and body movement. The superior colliculus and the pretectum are the two midbrain structures that mediate visual reflexes. The superior colliculus is located in the back of the midbrain, and its main function is to control eye movements. The superior colliculus is in charge of all eye motion, from quick eye movements (saccades) to smooth eye movements (pursuits). It also includes a topographical map of the visual environment that aids in the execution of eye movements. The pretectum is a tiny structure in the midbrain that controls pupil diameter and eye movement. The pretectum acts as a relay center for visual input from the retina and sends information to the Edinger-Westphal nucleus, which controls pupil size. Furthermore, the pretectum has connections with the motor neurons that control eye movement to mediate the optokinetic reflex.

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Proteins can be sorted into the one breaking of hydrogen bonds, breaks and/or forms covalent and that do not break any bonds.

The primary function of many proteins requires the breaking and forming of bonds.

Hydrogen bonds between the double helix must be broken.

Covalent bonds called phosphodiester linkages are also formed and broken during DNA replication.

Breaks hydrogen bonds:

- Helicase

Breaks and/ or forms covalent bonds:

- Primase, DNA polymerase I, DNA polymerase III, DNA ligase, DNA gyrase (topoisomerase)

Does not break any bonds:

- Single-stranded binding protein

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The reason for keeping a chloroplast in darkness for some time prior to fixation for electron microscopy is to deplete the starch content within the chloroplast.

Starch is a storage carbohydrate that accumulates in chloroplasts during the light period through photosynthesis.

By keeping the chloroplast in darkness, the plant is not actively performing photosynthesis, and therefore, the starch reserves are gradually depleted.

When preparing samples for electron microscopy, it is important to fix the chloroplasts.

If the chloroplast contains starch, it can be affected during the fixation process, leading to distortions in the final electron micrographs.

Thus, by depleting starch the chloroplast is closer to its natural state, allowing for more accurate observations and analysis under the electron microscope.

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Surface oceanic circulation results most directly in the distribution of heat from tropical to temperate and polar regions due to flow of water currents. Thus, the correct option is A.

Surface oceanic circulation is a general term for the currents that flow across the upper layer of the ocean's surface. These currents are propelled by winds, and they carry heat and dissolved substances around the planet's oceans. Surface oceanic circulation results most directly in the distribution of heat from tropical to temperate and polar regions. The surface oceanic circulation affects the distribution of heat from tropical to temperate and polar regions by regulating oceanic heat transport.

Heat is transported from the tropics to the polar regions by the oceans through the process of oceanic circulation. The surface oceanic circulation can also affect the distribution of water masses and biota, as well as controlling climate, sea level, and nutrient distributions within the world's oceans. Thus, the statement that best describes the results of surface oceanic circulation is that it directly affects the distribution of heat from tropical to temperate and polar regions.

Therefore, the correct option is A.

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The styloid process of the temporal bone is a thin, pointed bone protrusion located at the base of the skull just in front of the ear.  

The primary function of a styloid process is to provide attachment points for muscles and ligaments of the neck and face, more specifically, it serves as the attachment point for the stylohyoid ligament, which connects the hyoid bone to the styloid process, and for the stylomandibular ligament, which connects the mandible to the styloid process. It also provides attachment points for the styloglossus and stylopharyngeus muscles, which help to move the tongue and pharynx, respectively. Also, it helps to support the structures of the throat and neck, including the pharynx, larynx, and esophagus.

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Relatively small changes in DNA sequence are known as gene mutations.

"Mutation is a change in our DNA base pair sequence brought on by numerous environmental variables, such as UV radiation, or errors made during DNA replication," says the definition of the term.

The DNA sequence varies from creature to organism. The order of the base pairs can occasionally shift. We refer to it as a mutation. Changes in proteins that are translated from the DNA by a mutation are possible. In most cases, the cells are able to detect any harm brought on by mutation and fix it before it becomes irreversible.

A abrupt, heritable change in an organism's characteristics is called a mutation. One who demonstrates these heritable changes is referred regarded as a "mutant." Recessive genes are typically produced through mutations.

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The correct option is A, the result in hypovolemic shock is Peritonitis.

Peritonitis is infection of the localized or generalized peritoneum, the lining of the inner wall of the stomach and cover of the stomach organs. signs may additionally include severe ache, swelling of the abdomen, fever, or weight loss. One element or the complete stomach can be smooth. headaches might also consist of shock and acute breathing misery syndrome.

Reasons include perforation of the intestinal tract, pancreatitis, pelvic inflammatory ailment, stomach ulcer, cirrhosis, or a ruptured appendix. danger elements consist of ascites (the abnormal build-up of fluid in the abdomen) and peritoneal dialysis. prognosis is commonly based on examination, blood assessments, and medical imaging. Treatment frequently consists of antibiotics, intravenous fluids, pain medicine, and surgery. other measures may additionally consist of a nasogastric tube or blood transfusion.

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Complete Question: -

Which of the following can result in hypovolemic shock?

a. Peritonitis

b. Blood transfusion reaction

c. Acidosis

d. Vascular damage

The metabolic process of breaking down molecules is called catabolism. It is the breakdown of complex molecules into smaller ones. Catabolism is the opposite of anabolism, which is the metabolic process of building up molecules.

Catabolic reactions are responsible for breaking down molecules into simpler ones. These reactions typically release energy in the form of ATP, NADH, or FADH2.

Some examples of catabolic reactions include: Glycolysis: This is the breakdown of glucose into pyruvate, which releases energy in the form of ATP and NADH. It occurs in the cytoplasm of cells.

Citric Acid Cycle (Krebs Cycle): This is a series of reactions that occur in the mitochondria of cells. It breaks down pyruvate, fatty acids, and amino acids into carbon dioxide and energy in the form of ATP, NADH, and FADH2.Oxidative

Phosphorylation: This is the final stage of cellular respiration that occurs in the mitochondria of cells. It uses the energy from NADH and FADH2 to create a proton gradient that drives the production of ATP via ATP synthase. The breakdown of complex molecules into smaller ones is necessary to provide energy for cellular processes.

The products of catabolic reactions are often used in anabolic reactions to build more complex molecules.

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The RNA content in a cell includes both coding mRNA and several types of non-coding RNA. So the correct answer is option A.

RNA is a molecule with numerous functions in living cells, its most well-known function is as a messenger between DNA and ribosomes, which translates the genetic information contained in DNA into proteins. RNA is one of the most important substances in a cell, and it is involved in a variety of processes. A variety of types of RNA are present in cells.

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Different types of photopigments differ from one another based on the specific wavelengths of light they absorb and the color vision they enable.

Photopigments are proteins found in the cone cells of the retina, responsible for detecting light and color vision.

There are three types of cone cells in the retina, each containing a different type of photopigment that responds to different wavelengths of light: blue, green, and red. These photopigments are called opsin and they bind with a chromophore called retinal to form the complete photopigment.

Each type of opsin has a slightly different amino acid sequence, which determines the wavelengths of light it absorbs most effectively, and hence the color vision it enables. For example, the blue opsin absorbs shorter wavelengths of light, while the red opsin absorbs longer wavelengths. When different combinations of photopigments are stimulated by light, the brain can interpret the information to perceive a range of colors. Overall, the differences in the amino acid sequences of the opsin photopigments determine their spectral sensitivity and enable us to perceive different colors.

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Scientists hypothesize that over millions of years, the Y chromosome has lost genes to the X chromosome. In meiosis, the X and Y chromosomes pair during the pachytene stage. As a result, DNA recombination occurs.

The non-homologous regions of the X and Y chromosomes are unpaired. As a result, the Y chromosome will act as a substrate for meiotic recombination. As a result, some genes are transferred from the Y chromosome to the X chromosome.

A mutation in the male-determining chromosome (the Y chromosome) will be passed on to subsequent generations without any opportunity for recombination, as males only have one copy of this chromosome.

As a result, the Y chromosome will be more susceptible to mutational deterioration than the X chromosome, which is more frequently recombined in both sexes. This is one of the reasons that the Y chromosome is used to track evolutionary relationships within species.

The X chromosome is also subject to mutation and recombination, but because females have two copies of this chromosome, it is not as susceptible to loss.

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According to the given information, a farmer grows red, white, and pink carnations for a local flower shop. He can obtain the standard Mendelian ratio of 1:2:1 of white: pink: red flowers by letting the flowers self-cross.

The flower color phenotype exhibits incomplete dominance, and all heterozygous flowers are pink. Homozygous flowers are either red or white. The farmer wants the plants to produce enough of each color flower to meet customer demand, which is conveniently the standard Mendelian ratio of 1:2:1 of white: pink: red flowers.

He hypothesizes that this ratio can be obtained by letting the flowers self-cross. He plants 1000 total seed of 250 white flowers, 250 red flowers, and 500 pink flowers and lets the plants self-fertilize and perpetuate over three growing seasons.

He predicts the ratio will remain the same each generation.Analysis of collected data: The farmer predicts that by letting the flowers self-cross, the ratio will remain the same in each generation. The ratio of white: pink: red flowers in the first generation is 1:2:1, which is exactly what the farmer wanted. If the same ratio is maintained, then the second and third generations should also have the same ratio of white: pink: red flowers. Conclusion:The farmer's results confirm that his hypothesis was correct.

The results of his self-crossing experiment showed that the ratio of white: pink: red flowers remained the same in each generation, exactly what he had predicted. Thus, he can obtain the standard Mendelian ratio of 1:2:1 of white: pink: red flowers by letting the flowers self-cross.

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The following are some typical indicators of an emergency. Unexpected or severe pain Violent pain going through a person, especially in the stomach, head, or casket, may indicate a medical emergency.

Urgent scenario may exist if someone is bleeding heavily and the bleeding won't stop. Having trouble breathing A person who is having problems breathing may be experiencing a medical emergency. This could be the result of an asthma episode, a sympathetic reaction, or other factors. loss of information Someone losing consciousness or losing their memory might be a symptom of an emergency.

Seizures A seizure might be an indication of a serious medical condition. stroke warning signs Sudden impassivity, weakness or chinking on one side of the body, speech difficulties, or unexpected bewilderment may be symptoms of a stroke.

Painful casket It may be an indication of a heart attack if someone is experiencing chest discomfort, particularly if it is accompanied with shortness of breath, nausea, or perspiration.

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The steps involved in scientific method include observation, research question, hypothesis, experiment, result, conclusion, etc.

Steps of the scientific method in this study:

Observation: The researchers observed that college students often experience high levels of stress and that meditation has been suggested as a possible intervention for stress reduction.

Research question: The researchers formulated a research question: Does meditation reduce stress in college students?

Hypothesis: Based on previous research and theory, the researchers formulated a hypothesis: Meditation reduces stress in college students.

Experiment: The researchers designed an experiment to test their hypothesis. They recruited a group of college students and randomly assigned them to either a meditation group or a control group. The meditation group practiced meditation for eight weeks, while the control group did not.

Data collection: The researchers collected data on participants' stress levels before and after the eight-week intervention period.

Results: The researchers analyzed the data and found that the meditation group had significantly lower levels of stress compared to the control group.

Conclusion: Based on their findings, the researchers concluded that meditation is an effective intervention for reducing stress in college students.

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The sarcomere shortens when the myosin heads of the thick filaments, in a cocked position, form cross bridges with the actin molecules in thin filaments.

One complete cross bridge cycle consists of the following steps:

1. Attachment: The myosin head binds to an actin molecule, forming the cross bridge.

2. Power stroke: The myosin head then pivots, pulling the actin filament along with it.

3. Detachment: The myosin head is then released from the actin molecule, allowing the cycle to begin again.

4. Re-cocking: Myosin returns to its original cocked position, ready for another power stroke.

By repeatedly forming and breaking cross bridges, the sarcomere can shorten and generate force, thus allowing for muscle contraction.

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The correct option is C) This will not make the virus more or less virulent. The gene for salicylate hydroxylase carried by the virus does not impact the virus' virulence. The gene only breaks down salicylic acid, and so will not have any direct effect on the virus' ability to infect plants.

Virulence is the capacity of a pathogen or virus to produce disease. The virus's virulence, or the severity of the disease it causes, is typically determined by a variety of genetic factors. A particular species of virus carrying a gene for salicylate hydroxylase will not be more or less virulent to plants than other viruses since it will only cause damage to the plant in question by breaking down the salicylic acid that protects it. Salicylic acid is a plant hormone that aids in the activation of plant defense against pathogen infections. Therefore, if a virus breaks down salicylic acid, the plant will be less able to protect itself against pathogens, making it more susceptible to infection. Therefore, it will not make the virus more or less virulent.

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The correct values to be dragged are 1/16, 3/16, 1/8, 1/4, and 3/8, in that order.

Drag the correct value to the blank following each offspring typeView Available Hint(s) Reset Helptype A with M antigen: 1/16 3/16 1/8 1/4 3/8 type A with M and N antigens: 0 0 0 0 0 type A with N antigen: 1/16 3/16 1/8 1/4 3/8 type O with M antigen: 1/16 3/16 1/8 1/4 3/8 type O with M and N antigens: 1/16 3/16 1/8 1/4 3/8 type O with N antigen: 1/16 3/16 1/8 1/4 3/8

The FUT1 gene controls the synthesis of the H substance. If both parents are heterozygous for the FUT1 gene, it means they have an Hh genotype. Their possible gametes would be half H and half h. Now, we will use a Punnett square to show how the result in part A would change.

We have Type A with M antigen as an example:Gametes HH Hh Hh hh HH Hh Hh hh Offspring type A with M antigen A_A_ A_aa A_A_ A_aaProbability 1/4 1/4 1/4 1/4So, the results of the offspring type A with M antigen with parents who are heterozygous for the FUT1 gene (Hh) would change as follows: 1/4 of the offspring would have a genotype of A_A_ and would, therefore, have the M antigen on their RBC surface.

1/4 of the offspring would have a genotype of A_aa and would not have the M antigen on their RBC surface. Therefore, the correct values to be dragged are 1/16, 3/16, 1/8, 1/4, and 3/8, in that order.

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When force is applied to garlic, it responds by releasing the enzyme alliinase, which catalyses the creation of allicin, which then decomposes to produce a number of beneficial organosulfur compounds.

Crushing garlic before cooking may enable alliinase to function before cooking inactivates the enzyme, according to the study. Consuming too much raw garlic, especially on an empty stomach, might upset your stomach, make you flatulent, and affect the flora of your intestinal tract.

Effects: Topical use of raw garlic has been linked to allergic dermatitis, burns, and blisters. Heartburn, an upset stomach, and bad breath are all side effects. When using raw garlic, these negative effects could be more obvious. Garlic can cause allergic responses in certain people. Supplementing with garlic may make the bleeding worse.

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Correct Question:

What is force applied in garlic and effects on it.

DNA provides the instructions for the formation of proteins, which are the building blocks of our bodies. When there is a DNA alteration or mutation, the instructions for building a protein may be changed, which can affect the final protein product.

A protein is a large, complex molecule made up of chains of smaller molecules called amino acids. Proteins are found in every cell of every living organism and play a vital role in a wide range of biological processes.

Enzymes: catalyze chemical reactions in the body

Structural components: provide support and shape to cells and tissues

Hormones: regulate various bodily functions and processes

Transporters: move molecules and substances throughout the body

Antibodies: help defend against foreign invaders such as viruses and bacteria

Energy sources: can be broken down to release energy for cellular processes

Changes in the amino acid sequence, caused by genetic mutations or other factors, can alter the function of a protein and lead

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Obesity can affect fertility in males. This is because, testes move closer to the body and androgen production decreases. Thus, the correct options will be A and B.

Obesity in males can affect fertility in different ways. This is because overweight or obese males might encounter hormonal changes that can have an impact on fertility. Some possible ways that obesity in males can affect fertility are:Testes move closer to the body. This is due to the excessive fat around the testes which results in the testes to move closer to the body, leading to a rise in the temperature of the testes. This can affect sperm production, causing infertility.

Androgen production decreases. Obese males are more prone to having lower levels of testosterone. This hormone is responsible for many important functions, such as regulating sperm production, maintaining libido and sexual function, and promoting muscle and bone development. Low levels of testosterone can lead to low sperm counts and reduce fertility. Excess fat slows sperm motility. Overweight or obese males may have problems with the quality of their semen. Excess fat can interfere with the production and motility of sperm. Sperm motility refers to the ability of sperm to swim and reach the egg. If the motility of sperm is low, it can impact fertility. Body temperature decreases. Excessive fat in the body might result in a decreased body temperature. The testicles are situated outside of the body as they require to be kept cooler than the normal body temperature. If body temperature decreases due to excessive fat, it can interfere with the sperm production process and lead to infertility.

Therefore, the correct options will be A and B.

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Gene switch mutations could lead to evolution by natural selection as they affect the expression of a gene. This is based on the information you have gained from the video clips and animations.

If a gene switch is turned on in a cell that it was not turned on before, it leads to the production of a protein that is beneficial to the organism in that environment.This can give the organism an advantage in that particular environment, allowing it to reproduce more effectively, leading to the selection of the new beneficial trait. Gene switches can evolve by acquiring mutations, leading to changes in the sequence of the DNA that regulates gene expression.Based on the information, we have gained from the video clips and animations, gene duplication events are important ways that new genes evolve. One of the most common ways that new genes evolve is through gene duplication events.

A gene duplication event is when a gene is duplicated, leading to two or more copies of the gene being present in the genome of the organism. Subsequent mutations in the duplicated gene are important for evolution as it can lead to changes in the function of the protein encoded by the gene. The new protein encoded by the duplicated gene in the dachshund helps in the development of the dog's legs. The RNase I protein encoded by the duplicated gene is different from the RNase | encoded by the original gene because the new protein has a different function, it is expressed in a different tissue, and has a different pattern of expression.

A type of mutation around the Factor X gene that could allow the protein to be expressed in new tissues is a mutation that affects the regulation of the gene. This type of mutation could change the sequence of the gene switch that controls the expression of the gene. In 1-2 sentences, gene duplication events can be important for evolution as they can lead to the creation of new genes that have different functions, allowing organisms to adapt to new environments.

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the correct answer is ratio 1:(a t)/(g c) is constant for double-standard DNA, regardless of the species.

The ratio that is expected to be constant for double-stranded DNA, regardless of the species is Ratio 1.

Chargaff's rule is a basic principle in genetics that states that within a double-stranded DNA molecule, cytosine and guanine are present in equal proportions, as are adenine and thymine.

This is sometimes referred to as the "base-pairing rule," as each base (cytosine, guanine, adenine, or thymine) forms a "pair" with another specific base in the opposite strand of DNA.

A will be opposite T, and C will be opposite G.

The ratio of the bases A-T and G-C in double-stranded DNA is expected to be constant, regardless of the species.

Ratio 1: (A T)/(G C) is the ratio that is expected to be constant for double-stranded DNA, regardless of the species. The bases A-T and G-C pair up in DNA because of hydrogen bonding.

The ratio of base pairs is always equal. This is also known as Chargaff's rule.

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